固结效应粘土坝基复合土体的蠕变分析  

Creep Analysis of Composite Soil in Clay Dam Foundation Based on Consolidation Effect

作　　者：刘翔[1] 伍文[1] 王军[2] 曹平[3] 周军[1] LIU Xiang;WU Wen;WANG Jun;CAO Ping;ZHOU Jun(Hunan Urban Construction College,Xiangtan 411101,Hunan,China;Hunan Institute of Engineering,Xiangtan 411104,Hunan,China;Central South University,Changsha 410083,Hunan,China)

机构地区：[1]湖南城建职业技术学院,湖南湘潭411101 [2]湖南工程学院,湖南湘潭411104 [3]中南大学,湖南长沙410083

出　　处：《水力发电》2019年第7期51-54,共4页Water Power

基　　金：湖南省自然科学基金项目(2019JJ40056);湖南省教育厅科学研究项目(18A345,18C1256)

摘　　要：从粘土坝体结构组成出发,分析了坝基复合土体固结蠕变特性对坝体稳定性的影响。基于复合土体加速蠕变破坏特征,运用土力学和建筑地基处理知识,建立了改进的非线性西原蠕变模型,并得到了粘塑性应变率的解析式。通过算例得到了不固结不蠕变、不固结蠕变、固结不蠕变和固结蠕变等4种情况下坝体结构的竖向位移分布及加固范围。结果表明,固结蠕变情况下竖向位移最大,不固结不蠕变时竖向位移最小;不加固蠕变时,坝基的加固宽度与加固深度范围最大,而不固结蠕变时,加固区域为最小。Based on the structure of clay dam,the influence of the consolidation and creep characteristics of composite foundation on the stability of dam body is analyzed. Based on the characteristics of accelerated creep failure of composite soil,an improved nonlinear Xiyuan creep model is established by applying the knowledge of soil mechanics and building foundation treatment,and the analytical formula of viscoplastic strain rate is obtained. The vertical displacement distribution and reinforcement range of dam structure under four conditions of unconsolidated non-creep,unconsolidated creep,consolidated non-creep and consolidated creep are obtained respectively through an example. The calculation results show that,(a) the vertical displacement is the largest in the case of consolidated creep,and is the smallest in the case of unconsolidated non-creep;and (b) when the creep is not reinforced,the reinforcement width and depth range of dam foundation are the largest,and in the case of consolidated creep,the reinforcement area is the smallest.

关 键 词：土坝 坝基加固 固结 蠕变 竖向位移 

分 类 号：TU442[建筑科学—岩土工程]